but in terms of terrorism or even crime as an ongoing threat, in large-scale security environments like this, do you feel like we are actually better now at protecting large-scale security events like boston marathon? or like other sort of large-scale events that happen in other major cities than we were before 9/11? it's worrying to see something like this happen when we think we have been made so much safer, when we feel like we've at least been inconvenienced a lot more than we used to be. we're told security is so much tighter. how can something like this happen in an environment that's this secure and do you feel like we've made a lot of progress? >> rachel, that is a great question. and the answer is, although i still believe despite this awful tragedy, where at least three have been killed, that with are much, much safer. but what we've safer from is the risk of a catastrophic attack. we are never going to prevent these types of events. we hope that the intelligence will help us disrupt it before it happens like past plots against the new york city subway system. we hope that as